Very well.
I spoke nearly no Vietnamese and bikepacked across rural northern Vietnam for 3 months after buying my bicycle in Hanoi.
People in the city can speak some English, but even if they can't they're so earnestly helpful that I was able to easily buy clothes, bicycle repair items, get my bicycle repaired, buy food everyday(pho lyfe) be invited to tea and then a family feast, take shelter from a rainstorm, the stories of their generosity go on.
It's definitely a good country to visit.
haha me too, i thought it was pretty funny there.